Tong Li

Collaborative Innovation Center of Chemistry for Energy Materials

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Meng Meng

Collaborative Innovation Center of Chemistry for Energy Materials

Shih-Yuan Wang

Inner Mongolia University of Technology

Shining Zhu

Nanjing University

Qingqing Cheng

University of Shanghai for Science and Technology

Huayu Tian

Collaborative Innovation Center of Chemistry for Energy Materials

Huixin Li

Collaborative Innovation Center of Chemistry for Energy Materials

Qiong Yu

Collaborative Innovation Center of Chemistry for Energy Materials

Lei Wang

Nanjing University

Yumeng Xing

Xiamen University

Kai Hao

Xiamen University

Cooperative Institutions

Collaborative Innovation Center of Chemistry for Energy Materials

Xiamen University

Nanjing University

University of Science and Technology of China

Purple Mountain Laboratories

Chinese Academy of Sciences

Changchun Institute of Applied Chemistry

Collaborative Innovation Center of Advanced Microstructures

Nanjing Agricultural University

Xi'an Jiaotong University

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Resonant exceptional points sensing in terahertz metasurfaces

Applied Physics Letters (2024)

Lei Wang Hang Liu Tong Li Da Tian Caihong Zhang

The phenomenon of simultaneous degeneracy of eigenvalues and eigenstates in non-Hermitian systems, known as exceptional points (EPs), renders systems in the vicinity of EP highly sensitive to perturbations in the environment. Recently, research works on terahertz metasurfaces primarily focused on finding the degenerate eigenvalue using the transmission matrix, known as the scattering EP, while neglecting exploration of another form of EP—the resonant EP. In this study, we numerically, theoretically, and experimentally investigate the resonant EP in terahertz metasurfaces, whose unit cell is composed of two unidentical length metal rods in a two-energy level non-Hermitian system. By altering two system parameters, we can manipulate the coupling between the two resonators, thereby directly realizing the singularity of complex frequency through only a single measurement. Furthermore, our simulations and measurements indicate a sensitivity of up to 9046 GHz/(RIU·mm), which underscores the high sensitivity characteristics of EP. Our approach not only contributes a fresh perspective on understanding EP in non-Hermitian terahertz metasurfaces but also proposes alternative methods for high-sensitivity terahertz sensing.

10.1063/5.0193106

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Direct observation of guided-mode interference in polymer-loaded plasmonic waveguide

Applied Physics Letters (2012)

Qingqing Cheng Tong Li Ruochen Guo Lin Li Shih-Yuan Wang

We report a direct observation of guided-mode interference in polymer-loaded plasmonic waveguides by the technique of leakage radiation microscopy (LRM). Spatial beating patterns of the interferences were clearly characterized with respect to different structural parameters, and the interference properties were analyzed in detail. Besides, the capability of LRM for characterizing the multiple modes was also discussed extensively. Our finding not only offers an efficient technique in analyzing the guided modes and their interference, but also provides a definite guideline in evaluating the validity of LRM and deepens further studies on the dielectric-loaded hybrid waveguide system.

Waveguide

10.1063/1.4764116

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Precise and controllable synthesis of ultra-stable gold nanoparticles based on polymer templates for miRNA detection

Chemical Communications (2025)

Longwei Xiang Tong Li G. Fang Zhichao Shi Zhimin Luo

Here, a novel strategy for the preparation of ultra-stable gold nanoparticles was developed based on a core-shell structure of single-molecule micelles, which offered advantages such as convenience, rapid preparation, size control. These ultra-stable gold nanoparticles enable specific miRNA detection, facilitating the precise screening of tumor cells.

Template

10.1039/d4cc06024e

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Reduction of protein sequence complexity by residue grouping

Protein Engineering Design and Selection (2003)

Tong Li Kunyang Fan Jing Wang Wei Wang

It is well known that there are some similarities among various naturally occurring amino acids. Thus, the complexity in protein systems could be reduced by sorting these amino acids with similarities into groups and then protein sequences can be simplified by reduced alphabets. This paper discusses how to group similar amino acids and whether there is a minimal amino acid alphabet by which proteins can be folded. Various reduced alphabets are obtained by reserving the maximal information for the simplified protein sequence compared with the parent sequence using global sequence alignment. With these reduced alphabets and simplified similarity matrices, we achieve recognition of the protein fold based on the similarity score of the sequence alignment. The coverage in dataset SCOP40 for various levels of reduction on the amino acid types is obtained, which is the number of homologous pairs detected by program BLAST to the number marked by SCOP40. For the reduced alphabets containing 10 types of amino acids, the ability to detect distantly related folds remains almost at the same level as that by the alphabet of 20 types of amino acids, which implies that 10 types of amino acids may be the degree of freedom for characterizing the complexity in proteins.

Sequence (biology)

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Protein sequencing

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Protein superfamily

10.1093/protein/gzg044

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Citations (140)